Tapered ferrofluid seal

Details Tapered ferrofluid seal Tapered ferrofluid seal

1988-04-18

1990-01-02

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277135, F16J 1540, F16J 1554

Patent

active

048908509

ABSTRACT:
A ferrofluid seal wherin the amount of ferrofluid which may be used is increased by tapering the gap in which the ferrofluid is retained from one end of the gap to the other. One side of this gap is the magnet and, where used, pole pieces used to generate the magnetic field retaining the sealing ferrofluid, and the other side is a wall forming the opening to be sealed. The tapering of the gap width may be achieved by tapering either side forming the gap or by tapering both sides. The taper is preferably uniform from one end of the gap to the other.

REFERENCES:
patent: 2557140 (1951-06-01), Razdowitz
patent: 4171818 (1979-10-01), Moskowitz et al.
patent: 4357021 (1982-11-01), Raj et al.
patent: 4531846 (1985-07-01), Raj
patent: 4565379 (1986-01-01), Ballhaus
patent: 4630943 (1986-12-01), Stahl et al.
patent: 4694213 (1987-09-01), Gowda et al.
"Magnetic-Fluid Seals", Machine Design for Mar. 28, 1968, pp. 145-149.

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